air traffic control

n=3

a: Air traffic control ~

b: choreographed dance

What:

"Air traffic control is like a choreographed dance. You have to perform. It's like the dance. Once it starts, you have to follow it through. You have to make decisions, you have to make sure they're the right decisions, you have to assure separation and that safety is paramount. "

"Air traffic control is like playing chess in three dimensions – using potentially explosive pieces. If you are careful and keep a cool head, nothing will go wrong. The moves are all in the rule book, and there are computers to help plan each one and predict the consequences. Nothing should go wrong. Except, sometimes, it does."

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